//可点击，删除的导航栏
<template>
  <div class="tags-view-container">
    <scroll-pane class="tags-view-wrapper"
                 ref="scrollPane">
      <router-link ref="tag"
                   class="tags-view-item"
                   :class="isActive(tag)?'active':''"
                   v-for="tag in Array.from(visitedViews)"
                   :to="tag"
                   :key="tag.path"
                   @contextmenu.prevent.native="openMenu(tag,$event)">
        {{tag.title}}
        <span class="el-icon-close"
              @click.prevent.stop="closeSelectedTag(tag)"></span>
      </router-link>
    </scroll-pane>

    <ul ref="contextmenu"
        class="contextmenu"
        v-show="visible"
        :style="{left:left+'px',top:top+'px'}">
      <li @click="closeSelectedTag(selectedTag)">
        <!-- 关闭 -->
        关闭
      </li>
      <li @click="closeOthersTags">
        <!-- 关闭其他 -->
        关闭其他
      </li>
      <li @click="closeAllTags">
        <!-- 关闭全部 -->
        关闭全部
      </li>
    </ul>
  </div>
</template>

<script>
import ScrollPane from "@/components/ScrollPane";

export default {
  components: { ScrollPane },
  data () {
    return {
      visible: false,
      top: 0,
      left: 0,
      selectedTag: {}
    };
  },
  computed: {
    visitedViews () {
      return this.$store.state.tagsView.visitedViews;
    }
  },
  watch: {
    $route () {
      this.addViewTags();
      this.moveToCurrentTag();
    },
    visible (value) {
      if (value) {
        document.body.addEventListener("click", this.closeMenu);
      } else {
        document.body.removeEventListener("click", this.closeMenu);
      }
    }
  },
  mounted () {
    this.addViewTags();
  },
  methods: {
    generateRoute () {
      if (this.$route.name) {
        return this.$route;
      }
      return false;
    },
    isActive (route) {
      return route.path === this.$route.path;
    },
    addViewTags () {
      const route = this.generateRoute();
      if (!route) {
        return false;
      }
      this.$store.dispatch("addVisitedViews", route);
    },
    moveToCurrentTag () {
      const tags = this.$refs.tag;
      this.$nextTick(() => {
        for (const tag of tags) {
          if (tag.to.path === this.$route.path) {
            this.$refs.scrollPane.moveToTarget(tag.$el);
            break;
          }
        }
      });
    },
    closeSelectedTag (view) {
      this.$store.dispatch("delVisitedViews", view).then(views => {
        if (this.isActive(view)) {
          const latestView = views.slice(-1)[0];
          if (latestView) {
            this.$router.push(latestView);
          } else {
            this.$router.push("/");
          }
        }
      });
    },
    closeOthersTags () {
      this.$router.push(this.selectedTag);
      this.$store.dispatch("delOthersViews", this.selectedTag).then(() => {
        this.moveToCurrentTag();
      });
    },
    closeAllTags () {
      this.$store.dispatch("delAllViews");
      this.$router.push("/");
    },
    openMenu (tag, e) {
      const menuMinWidth = 105
      const offsetLeft = this.$el.getBoundingClientRect().left // container margin left
      const offsetWidth = this.$el.offsetWidth // container width
      const maxLeft = offsetWidth - menuMinWidth // left boundary
      const left = e.clientX - offsetLeft + 15 // 15: margin right
      if (left > maxLeft) {
        this.left = maxLeft
      } else {
        this.left = left
      }
      this.top = e.offsetY
      this.visible = true
      this.selectedTag = tag
    },
    closeMenu () {
      this.visible = false;
    }
  }
};
</script>

<style rel="stylesheet/scss" lang="scss" scoped>
.tags-view-container {
  position: relative;
  background: #fff;
  .tags-view-wrapper {
    height: 34px;
    border-bottom: 1px solid #d8dce5;
    box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.12), 0 0 3px 0 rgba(0, 0, 0, 0.04);
    .tags-view-item {
      display: inline-block;
      position: relative;
      height: 26px;
      line-height: 26px;
      border: 1px solid #d8dce5;
      color: #495060;
      background: #fff;
      padding: 0 8px;
      font-size: 12px;
      margin-left: 5px;
      margin-top: 4px;
      &:first-of-type {
        margin-left: 1rem;
      }
      &.active {
        background-color: #42b983;
        color: #fff;
        border-color: #42b983;
        &::before {
          content: '';
          background: #fff;
          display: inline-block;
          width: 8px;
          height: 8px;
          border-radius: 50%;
          position: relative;
          margin-right: 2px;
        }
      }
    }
  }
  .contextmenu {
    margin: 0;
    background: #fff;
    z-index: 100;
    position: absolute;
    list-style-type: none;
    padding: 5px 0;
    border-radius: 4px;
    font-size: 12px;
    font-weight: 400;
    color: #333;
    box-shadow: 2px 2px 3px 0 rgba(0, 0, 0, 0.3);
    li {
      margin: 0;
      padding: 7px 16px;
      cursor: pointer;
      &:hover {
        background: #eee;
      }
    }
  }
}
</style>

<style rel="stylesheet/scss" lang="scss">
//reset element css of el-icon-close
.tags-view-wrapper {
  .tags-view-item {
    .el-icon-close {
      width: 16px;
      height: 16px;
      vertical-align: 2px;
      border-radius: 50%;
      text-align: center;
      transition: all 0.3s cubic-bezier(0.645, 0.045, 0.355, 1);
      transform-origin: 100% 50%;
      &:before {
        transform: scale(0.6);
        display: inline-block;
        vertical-align: -3px;
      }
      &:hover {
        background-color: #b4bccc;
        color: #fff;
      }
    }
  }
}
</style>
